What is the orientation of the image on the retina of an eye?
A. Upright
B. Inverted
C. It depends on how close the object is.
D. There is no way to know.
Ans: B. Inverted
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The "efficiency" of a heat engine is defined to be
A) thermal energy output divided by work input. B) work output divided by thermal energy output. C) work output divided by thermal energy input. D) thermal energy output divided by thermal energy input.
The amplitude of a system moving with simple harmonic motion is doubled. The total energy will then be
a. 4 times as large. b. 3 times as large. c. 2 times as large. d. the same as it was. e. half as much.
If the primary coil of a transformer contains more loops than the secondary coil then it is a
A) step-up transformer. B) step-down transformer.
A solenoid of length l = 0.7 m and radius R = 5 cm stores an amount of energy U = 6 × 10-6 J when a current I = 0.4 A passes through it. What is the winding density of the solenoid?
A) 865 turns /m B) 472 turns/m C) 1078 turns/m D) 104 turns/m E) 327 turns /m